I am having extreme health anxiety after a serious illness that has now been cured. my vigilance in checking for symptoms have taken over my life and made me unbearably anxious. on meds and in therapy?

Lingering anxiety: Cognitive behavior therapy, mindfulness, and exposure /response prevention may help for what could be OCD. Find a psychologist skilled in these areas and in anxiety management .

Feeling Good is a: book by David Burns for anxiety and depression. It is cognitive therapy which can help you manage your irrational thoughts and the very tiny bit of truth that snags you. Peace and good health.

Meds and therapy: The experience of going through a possibly devastating condition and uncertain outcome is really traumatic. The after effects are some kind of post traumatic stress disorder, with symptoms like you are describing. You could benefit from an appropriate combination of psychotherapy and medication management. I suggest to ask your doctor for a referral to a mental health practitioner or clinician.